1 files changed, 192 insertions, 0 deletions
diff --git a/private/ntos/nthals/halsnip/mips/jxenvirv.c b/private/ntos/nthals/halsnip/mips/jxenvirv.c
new file mode 100644
index 000000000..6584e3a56
--- /dev/null
+++ b/private/ntos/nthals/halsnip/mips/jxenvirv.c
@@ -0,0 +1,192 @@
+//#pragma comment(exestr, "$Header: /usr4/winnt/SOURCES/halpcims/src/hal/halsnipm/mips/RCS/jxenvirv.c,v 1.2 1995/11/02 11:04:33 flo Exp $")
+
+/*++
+
+Copyright (c) 1991  Microsoft Corporation
+Copyright (c) 1993  Siemens Nixdorf Informationssyteme AG
+
+Module Name:
+
+    jxenvirv.c
+
+Abstract:
+
+    This module implements the HAL get and set environment variable routines
+    for a MIPS system.
+
+Environment:
+
+    Kernel mode
+
+NOTES:
+    --- Preliminary using ARC function calls ---
+
+--*/
+
+
+#include "halp.h"
+#include "arccodes.h"
+#include "arc.h"    
+    
+    // preliminary calls to the ARC functions (function vector call)
+
+    /* NOTE:
+        This is strongly discouraged by the ARC specifications.
+        Only "reset"/return calls to the prom are recommended.
+        All other system access to the NVRAM should be handled
+        by operating systems functions directly. For that the
+        operating system has to know the algorithms for handling
+        those data structures (e.g. the checksum calculations).
+        Though is a drawback in terms of HW/FW-independance NT
+        seems to avoid side effects of ARC function code that way,
+        e.g. via register/stack manipulations.
+    */
+
+//
+// The following addresses are defined by ARC and handed over to the osloader.
+// For now we assume that the osloader will leave this memory part unchanged
+// for the operating system (NT), which itself also doesn't overwrite that
+// data structure.
+// We don't (yet) know yet know whether the firmware copies or maps/banks
+// runnable code into the physical memory (or if it just sets up a vector
+// into the prom). We also do not know whether the NVRAM variables are copied
+// into physical memory or mapped/banked by the (ARC) firmware.
+//
+
+//
+// Therefore we preliminary use the ARC entry vectors from ARC.H
+//
+
+
+ARC_STATUS
+HalGetEnvironmentVariable (
+    IN PCHAR Variable,
+    IN USHORT Length,
+    OUT PCHAR Buffer
+    )
+
+/*++
+
+Routine Description:
+
+    This function locates an environment variable and returns its value.
+
+Arguments:
+
+    Variable - Supplies a pointer to a zero terminated environment variable
+        name.
+
+    Length - Supplies the length of the value buffer in bytes.
+
+    Buffer - Supplies a pointer to a buffer that receives the variable value.
+
+Return Value:
+
+    ESUCCESS is returned if the enviroment variable is located. Otherwise,
+    ENOENT is returned.
+
+NOTE:
+    This implementation returns the error code ENOMEM if the output buffer
+    is too small.
+
+--*/
+
+{
+
+    PUCHAR Environment_var;
+    ULONG Index;
+    ARC_STATUS Status;
+
+    //
+    // retrieve the variable
+    //
+
+    Environment_var = (PUCHAR)ArcGetEnvironmentVariable(Variable);
+
+    if (Environment_var == (PUCHAR)NULL) {
+
+        Status = ENOENT;
+
+    } else {
+
+        //
+        // Copy the specified value to the output buffer.
+        //
+
+    for (Index = 0; Index < Length; Index += 1) {
+            *Buffer = READ_REGISTER_UCHAR(Environment_var);
+            if (*Buffer == 0) {
+                break;
+            }
+
+            Buffer += 1;
+        Environment_var += 1;
+        }
+
+        //
+        // If the length terminated the loop, then return not enough memory.
+        // Otherwise, return success.
+        //
+
+        if (Index == Length) {
+            Status = ENOMEM;
+
+    } else {
+            Status = ESUCCESS;
+    }
+    }
+
+    return Status;
+}
+
+ARC_STATUS
+HalSetEnvironmentVariable (
+    IN PCHAR Variable,
+    IN PCHAR Value
+    )
+
+/*++
+
+Routine Description:
+
+    This function creates an environment variable with the specified value.
+
+Arguments:
+
+    Variable - Supplies a pointer to an environment variable name.
+
+    Value - Supplies a pointer to the environment variable value.
+
+Return Value:
+
+    ESUCCESS is returned if the environment variable is created. Otherwise,
+    ENOMEM is returned.
+
+NOTES:
+    This preliminary implementation always returns ESUCCESS even in case of
+    error.
+
+--*/
+
+{
+
+    ARC_STATUS Status;
+
+    Status = ArcSetEnvironmentVariable(Variable, Value);
+
+    switch (Status) {
+    
+    case ESUCCESS:
+        break;
+
+    case ENOSPC:
+        break;    // until further we assume NT can handle that
+
+    case ENOMEM:
+    default:
+        Status = ENOMEM;
+        break;
+    }
+    return Status;
+}
+